1381277744 has 80 divisors (see below), whose sum is σ = 3532916736. Its totient is φ = 506496000.

The previous prime is 1381277707. The next prime is 1381277771. The reversal of 1381277744 is 4477721831.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 1381277695 and 1381277704.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12032 + ... + 53919.

Almost surely, 2^1381277744 is an apocalyptic number.

1381277744 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1381277744 is an abundant number, since it is smaller than the sum of its proper divisors (2151638992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381277744 is a wasteful number, since it uses less digits than its factorization.

1381277744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65994 (or 65988 counting only the distinct ones).

The product of its digits is 263424, while the sum is 44.

The square root of 1381277744 is about 37165.5451191019. The cubic root of 1381277744 is about 1113.6797887503.

The spelling of 1381277744 in words is "one billion, three hundred eighty-one million, two hundred seventy-seven thousand, seven hundred forty-four".